JP7036076B2 - How to manufacture the stator - Google Patents

Description

The present invention relates to a method for manufacturing a stator.

Conventionally, a method of manufacturing a stator by inserting a coil into a slot of a stator core is known. For example, Japanese Patent Application Laid-Open No. 2000-125521 (Patent Document 1) discloses a coil insertion device that inserts a loop-shaped coil into a slot of a stator core.

Japanese Unexamined Patent Publication No. 2000-125521

In the stator, in order to reduce the loss of the motor, it is necessary to wind the coil in the slot of the stator core so that the gap becomes small. In the slot of the stator, in order to improve the space factor, it is necessary to perform so-called aligned winding or the like in which the coils are arranged regularly.

As a method of inserting the coil into the integrated stator core, there is a method of pushing the annular coil from the slot open. However, with this method, aligned winding cannot be performed and the space factor is low.

In view of the above problems, the present invention provides a method for manufacturing a stator that can improve the space factor of the stator.

The method for manufacturing a stator from the first aspect of the present invention is a method for manufacturing a stator having a stator core having a plurality of slots penetrating in the axial direction, and forms an annular coil bundle in which a coil wire is wound a plurality of times. A step of inserting the coil bundle into the slot from the lower side in the axial direction of the slot to the upper side, and a step of compressing the coil bundle in the lower side in the axial direction of the stator core.

The present invention can provide a method for manufacturing a stator that can improve the space factor of the stator.

FIG. 1 is a cross-sectional view of a cross section perpendicular to the axial direction of the stator. FIG. 2 is a schematic diagram mainly showing a coil bundle. FIG. 3 is a schematic diagram mainly showing a bent coil bundle. FIG. 4 is a schematic view of the winding mold when viewed from the side. FIG. 5 is a schematic view of the winding mold when viewed from above. FIG. 6 is a schematic diagram of the first partition. FIG. 7 is a schematic diagram of the second partition. FIG. 8 is a schematic diagram of the third partition. FIG. 9 is a diagram showing a manufacturing process of the stator. FIG. 10 is a schematic view showing a process of forming a coil. FIG. 11 is another schematic diagram showing the process of forming the coil. FIG. 12 is another schematic diagram showing the process of forming the coil. FIG. 13 is another schematic diagram showing the process of forming the coil. FIG. 14 is another schematic diagram showing the process of forming the coil. FIG. 15 is another schematic diagram showing the process of forming the coil. FIG. 16 is another schematic diagram showing the process of forming the coil. FIG. 17 is another schematic diagram showing the process of forming the coil. FIG. 18 is a schematic view seen from the arrow XVIII in FIG. FIG. 19 is a schematic view seen from the arrow XIX in FIG. FIG. 20 is a schematic view seen from the arrow XX in FIG. FIG. 21 is a cross-sectional view taken along the line segment XXI-XXI in FIG. FIG. 22 is a schematic view in which a wedge-shaped jig or a wedge is wound into a winding mold. FIG. 23 is a schematic view showing a step of inserting. FIG. 24 is a schematic diagram showing a step of inserting and a step of compressing. FIG. 25 is a schematic diagram showing a compression process. FIG. 26 is a schematic diagram showing a restoration process. FIG. 27 is a schematic view showing a process of storing. FIG. 28 is another schematic view showing the storage process. FIG. 29 is another schematic view showing the storage process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and the description thereof will not be repeated.

Further, in the following description, the direction in which the central axis of the stator 1 extends, that is, the penetrating direction of the slot is defined as the “axial direction”. One side along the axial direction is the upper side, and the other side is the lower side. The vertical direction is used to specify the positional relationship, and does not limit the actual direction. That is, the downward direction does not necessarily mean the direction of gravity. The axial direction is not particularly limited, and includes a vertical direction, a horizontal direction, a direction intersecting these directions, and the like.

Further, the direction orthogonal to the central axis of the stator 1 is defined as the "diameter direction". One side along the radial direction is the inside, and the other side is the outside. Further, the direction along the arc centered on the central axis of the stator 1 is defined as the "circumferential direction".

Further, in the drawings used in the following description, the featured portion may be enlarged and shown for the purpose of emphasizing the featured portion. Therefore, the dimensions and proportions of each component are not necessarily the same as the actual ones. Further, for the same purpose, a part that is not a feature may be omitted in the illustration.

(Stator)
As shown in FIG. 1, the stator 1 is a component of a motor and interacts with a rotor (not shown) to generate rotational torque. The stator 1 includes a coil bundle 10, a stator core 20, an insulating paper 30, and a wedge 40. The stator 1 of the present embodiment is a distributed winding in which a coil is wound across several slots 21.

<Stator core>
The stator core 20 of the present embodiment is an integrated stator core 20. A split type stator core may be used. The stator core 20 is formed in a hollow cylindrical shape. The stator core 20 is formed by stacking thin silicon steel plates. A plurality of teeth 23 are radially formed on the stator core 20. A slot 21 is formed between the teeth 23. The teeth 23 extend radially through the slot 21.

The slot 21 has a slot open 22 which is a radial opening of the slot 21. The slot open 22 is smaller than the circumferential width of the space accommodating the coil side portion 11 in the slot 21. The slot open 22 is formed in the central portion of the slot 21 in the circumferential direction.

<Coil bundle>
The coil bundle 10 is formed by winding a coil wire in an annular shape. The direction in which the coil wires of the coil bundle 10 are arranged as a bundle is the radial direction. The coil wire of the present embodiment is a round wire, but is not particularly limited, and may be a flat wire or the like.

FIG. 2 schematically shows a coil bundle in which the blades 131 and 132 of the winding type 100, the coil moving mechanism 150, and the coil stopper 160, which will be described later, are shown. As shown in FIG. 2, the coil bundle 10 has two coil side portions 11 and a coil crossing portion 12.

The two coil sides 11 are housed in the slot 21. The coil side portion 11 extends in the axial direction. Specifically, the slot 21 in which one coil side portion 11 is housed and the slot 21 in which the other coil side portion 11 is housed are different. The slot 21 in which one coil side portion 11 is housed and the slot 21 in which the other coil side portion 11 is housed may be adjacent to each other, and may be arranged in the circumferential direction via another slot. May be good.

The coil side portion 11 is an aligned winding. That is, in the aligned winding, the coil side portions 11 are regularly laminated in a predetermined direction. The coil side portions 11 of the present embodiment are regularly stacked in the circumferential direction in the slot 21, but the present invention is not limited to this.

The coil crossing portion 12 connects two coil side portions 11. The coil crossovers 12 are arranged on both sides in the axial direction. Specifically, the coil crossing portion 12 located on the upper side in the axial direction is an upper coil end connecting the upper end portions of the two coil side portions 11. The coil crossover portion 12 located on the lower side in the axial direction is a lower coil end connecting the lower end portions of the coil side portions 11.

The coil bundle has a first bending mark 13a and a second bending mark 13b on the upper side in the axial direction. The first bending mark 13a is a mark that is bent in the radial direction. The second bending mark 13b is a mark that is bent in the circumferential direction toward the slot open 22 on the upper side in the axial direction from the first bending mark 13a.

<Insulated paper>
As shown in FIG. 1, the insulating paper 30 covers a coil side portion 11 composed of a plurality of coil wires inserted into the slot 21. The insulating paper 30 is arranged along the teeth that partition the space excluding the radial inside in the slot 21. The insulating paper 30 of this embodiment has a U-shape.

<Wedge>
The wedge 40 is arranged between the coil wire arranged in the slot 21 and the slot open 22. The coil bundle 10 may or may not be covered with the insulating paper 30. The wedge 40 closes the slot open 22.

The wedge 40 of the present embodiment is arranged at the upper end portion in the slot 21. Further, the wedge of the present embodiment is U-shaped in the axial direction. The axial length of the wedge 40 is smaller than the axial length of the slot 21. The wedge 40 may be omitted.

[Wrap type]
The winding type 100 of the present embodiment will be described with reference to FIGS. 3 to 8. As shown in FIGS. 3 to 5, the winding mold 100 includes a main body 110, a partition 120, a plurality of blades 131 and 132, and a support member 140. By winding the coil wire around the winding mold 100, the bent coil bundle shown in FIG. 3 is formed.

<Bending coil bundle>
FIG. 3 schematically shows a bent coil bundle in which the first partition 120a, the second partition 120b, the third partition 120c, and the blades 131 and 132 of the winding mold 100 are shown. The bent coil bundle is formed by bending an annular coil bundle using a winding mold 100 in a step of bending the upper side of the coil bundle (S13, S14, S16) described later. "Bending" means tilting the upper end of the coil bundle inward in the radial direction.

The bent coil bundle has a first layer 16, a second layer 17, and a third layer 18 as a plurality of coil groups. The second layer 17 is located on the outer peripheral side of the first layer 16. The third layer 18 is located on the outer peripheral side of the second layer 17.

The first to third layers 16 to 18 have different axial positions on the upper side in the axial direction. In the present embodiment, the third layer 18, the first layer 16, and the second layer 17 are located on the upper side of the coil bundle 10 in the axial direction in order from the axial direction. That is, the third layer 18 is an upper coil bundle, the first layer 16 is a middle coil bundle, and the second layer 17 is a lower coil bundle.

Axial positions are aligned on the lower side of the coil bundle in the axial direction. That is, the lower coil crossover portion 12 is located on the same plane.

The axial lengths of the first layer 16, the second layer 17, and the third layer 18 are different from each other. In the present embodiment, the second layer 17, the first layer 16, and the third layer 18 are arranged in ascending order of axial length.

Each of the first layer 16, the second layer 17, and the third layer 18 is arranged with one or more rows of coil wires in the circumferential direction. In each of the rows, a plurality of coil wires are arranged in the radial direction.

The bent coil bundle has an inclined portion 14. Specifically, each of the first to third layers 16 to 18 has an inclined portion 14. The inclined portion 14 of the third layer 18, the inclined portion 14 of the first layer 16, and the inclined portion 14 of the second layer 17 are located in this order from the axial direction.

The inclined portion 14 is inclined with respect to the coil side portion 11 extending in the axial direction. The inclined portion 14 includes a coil crossing portion 12 connecting two coil side portions 11. The inclined portion 14 has a passing portion 15 that passes through the slot open 22 in the insertion step (S30) described later. In the passing portion 15, coil wires are laminated in the axial direction. The circumferential length of the passing portion 15 is smaller than the circumferential length of the slot open 22.

<Main body>
As shown in FIG. 4, the main body 110 extends in the axial direction. The main body 110 has a substantially rectangular parallelepiped shape.

The main body 110 includes a winding surface around which the coil wire is wound. The winding surface of the main body 110 has a lower winding surface 111 and a side winding surface 112. The lower winding surface 111 is provided on the lower side in the axial direction. Specifically, the lower winding surface 111 is provided on the lower surface of the main body 110. The side winding surface 112 is provided on two opposite surfaces of the main body 110. In detail, the side winding surface 112 extends in the axial direction and is provided on the side surfaces facing each other.

As shown in FIG. 5, the distance between the side winding surfaces 112 becomes narrower toward the inside in the radial direction. The distance between the facing side winding surfaces 112 is the same as the shape of the slot 21. Specifically, the distance between the side winding surfaces 112 facing each other is the same as the distance between the two slots 21 into which the coil bundle 10 is inserted. The same means the same except for the dimensional tolerance and the gap at the time of winding. The axial length of the side winding surface 112 is the same as or shorter than the axial length of the slot 21.

<Partition>
As shown in FIG. 4, the partition 120 is arranged on the upper side of the main body 110 in the axial direction at intervals from the main body 110. The circumferential length of the partition 120 may be the same as the circumferential length of the main body 110. The partition 120 has, for example, a semicircular shape in the axial direction, and is located on both ends of the main body 110 in the circumferential direction.

The winding mold 100 includes a plurality of partitions 120 having different axial positions. In the winding mold 100 of the present embodiment, the first partition 120a, the second partition 120b, and the third partition 120c are located in this order from the bottom in the axial direction. In this specification, at least one of the first to third partitions 120a to 120c is also simply referred to as a partition 120.

In the present embodiment, inside the blades 131 and 132 in the radial direction, each partition 120 is arranged at a position where the diameter of the coil bundle increases toward the upper side in the axial direction. Specifically, the diameter of the coil bundle wound around the third partition 120c is larger than the diameter of the coil bundle wound around the second partition 120b. The diameter of the coil bundle wound around the second partition 120b is larger than the diameter of the coil bundle wound around the first partition 120a.

Each partition 120 is supported by a support member 140. Each support member 140 moves in the radial direction. Specifically, each support member 140 rotates in the radial direction. The rotation axes T of each support member 140 coincide with each other. Due to the rotation of each support member 140, each partition 120 moves in the radial direction due to the rotational movement. That is, each partition 120 moves in the radial direction with respect to the main body 110. Each partition 120 is moved around a common axis T. That is, a plurality of partitions 120 are moved in the radial direction around one axis T. As a result, the position of each partition 120 can be changed in the radial direction by a common drive mechanism, so that the winding type 100 can be simplified.

In this way, since each partition 120 moves in the radial direction, each partition 120 can be arranged in an arbitrary area above the main body 110. Specifically, on the upper side of the main body 110, a relief area A, a winding area B, and a bending area C are provided from the outside in the radial direction to the inside. The winding area B is an area for arranging the partition 120 used in the process of winding the coil wire. The winding area B is located directly above the main body 110. The bending area C is an area for arranging the partition 120 used in the process of bending the coil bundle around which the coil wire is wound. The bending area C is located radially inside the main body 110. The retreat area A is an area for arranging the partition 120 in which the step of winding the coil wire and the step of bending the coil bundle are not performed. The retreat area A is located radially outside the main body 110.

In the present embodiment, each partition 120 has a radial position before the coil wire is wound and a radial position when the coil wire is wound. Each partition 120 is located in the retreat area A before the coil wire is wound, and is located in the winding area B when the coil wire is wound.

Further, each partition 120 has a different radial position after the coil wire is wound and a radial position when the coil wire is wound. Each partition 120 is located in the winding area B when the coil wire is wound, and moves to the bending area C after the coil wire is wound.

At least a part of each partition 120 overlaps in the axial direction on the inner side in the radial direction from the blades 131 and 132. Further, the positions of the partitions 120 in the step of winding the coil wire around the winding mold 100 overlap in the axial direction. Since each partition 120 moves in the radial direction, at least a part of each partition 120 overlaps in the axial view by moving.

Each partition 120 includes a winding surface around which the coil wire is wound. The winding surface of the partition 120 has an upper winding surface 121 and a side winding surface 122. The upper winding surface 121 is provided on the upper side in the axial direction. Specifically, the upper winding surface 121 is provided on the upper surface of the partition 120. Each upper winding surface 121 has a different axial position.

The upper winding surface 121 is positioned inward in the radial direction and inclines toward the lower side in the axial direction. When winding the coil wire, the diameter of the coil bundle on the upper winding surface 121 of the partition 120 becomes smaller toward the inside in the radial direction. Further, the upper winding surface 121 is located on the lower side in the axial direction and inclines toward the inner side in the radial direction. The upper winding surface 121 has a radial gap with the side winding surface 112 of the main body 110.

The side winding surface 122 is provided on two opposite surfaces of the partition 120. Specifically, the side winding surface 122 is provided on the opposite side surface. The side winding surface 122 is located radially inward toward the upper side in the axial direction and is inclined. Further, the side winding surface 122 is positioned on the upper side in the axial direction and inclines toward the inner side in the radial direction.

As shown in FIGS. 6 to 8, the upper winding surface 121 has a groove 125 along the direction in which the coil wire is wound. Further, the side winding surface 122 has a groove 126 along the direction in which the coil wire is wound. The grooves 125 and 126 guide and wind the coil wire.

Each partition 120 is partitioned by the sum of the diameters of a plurality of coiled wires wound simultaneously and has a wall portion 127 extending in the direction in which the coiled wires are wound. The coil wires to be wound at the same time can be arranged in a row on the winding surface between the wall portions 127. In FIGS. 6 to 8, since 10 coil wires are wound at the same time, the diameter of the coil wires × 10 is the distance L between the wall portions 127.

As shown in FIG. 6, the upper winding surface 121a of the first partition 120a has a plurality of surfaces having different axial positions. That is, the plurality of faces are not located on the same plane. Specifically, the two upper winding surfaces 121a partitioned by the wall portion 127 are parallel to each other. However, the extending heights of the plurality of surfaces of the upper winding surface 121 are displaced by a diameter that is an integral multiple of the coil wire. In FIG. 7, the upper winding surface 121a on the right side partitioned by the wall portion 127 is located on the upper side in the axial direction by the diameter of the coil wire with respect to the upper winding surface 121a on the left side.

Here, the winding frame composed of the lower winding surface 111 and the side winding surface 112 of the main body 110 and the upper winding surface 121a and the side winding surface 122a of the first partition 120a is referred to as a lower winding frame. To tell. The winding frame composed of the lower winding surface 111 and the side winding surface 112 of the main body 110 and the upper winding surface 121b and the side winding surface 122b of the second partition 120b is called a middle winding frame. The winding frame composed of the lower winding surface 111 and the side winding surface 112 of the main body 110 and the upper winding surface 121c and the side winding surface 122c of the third partition 120c is called an upper winding frame.

<Blade>
As shown in FIG. 5, the plurality of blades 131 and 132 are arranged inside the main body 110 in the radial direction. As shown in FIG. 3, the plurality of blades 131 and 132 extend in the axial direction. The blades 131 and 132 are rod-shaped members. The blades 131 and 132 may be attached to the main body 110 or may be separated.

The pair of blades 131 and 132 sandwich the coil wire extending between the main body 110 and the partition 120 from the inside and the outside in the circumferential direction of the coil bundle 10. The circumferential direction of the coil bundle 10 is the inner peripheral side on the two coil side portions 11 facing each other and the outer peripheral side on the opposite side with respect to the coil bundle. As shown in FIG. 3, the pair of blades 131 and 132 are located at both ends in the circumferential direction of the main body 110. That is, two pairs of blades 131 and 132 are arranged for one main body 110 part.

As shown in FIG. 3, the upper end portions of the pair of blades 131 and 132 in the axial direction face each other with an R shape. That is, an R shape is formed on the facing surfaces at the upper ends of the blades 131 and 132. The R shape is provided to easily guide the coil wire to the blade. The R shape is a shape that curves in an arc shape. By having the R shape, the coil wire is smoothly guided between the blades 131 and 132 in the step of winding the coil wire described later.

The blade 131 that sandwiches the coil wire from the inside in the circumferential direction of the coil bundle is configured to be movable in the axial direction. The blade 131 of the present embodiment moves in the axial direction by the coil moving mechanism 150 described later. By moving the blade 131 in the axial direction, it is possible to avoid cushioning against a change in the radial position of the partition 120.

The circumferential distance between the blades 131 and 132 sandwiching the coil wire from the inside and outside of the coil bundle is smaller than or the same as the circumferential width of the slot open 22 which is the radial opening of the slot 21. .. Thereby, in the step (S30) of inserting the coil bundle into the slot 21 described later, a row of coil wires passing through the slot open 22 can be easily formed.

The blades 131 and 132 are also used in the step of holding the coil bundle (S20). The blades 131 and 132 are also used in the step (S30) of inserting the coil bundle into the slot 21. The blades 131 and 132 are also used in the step (S60) of accommodating the coil bundle in the slot 21. That is, the blades 131 and 132 used in the step of bending the upper side of the coil bundle are common to the blades used in the holding step (S20), the inserting step (S30), and the storing step (S60).

[Manufacturing method of stator]
A method for manufacturing the stator 1 of the present embodiment will be described with reference to FIGS. 1 to 29.

<Formation of annular coil bundle>
First, as shown in FIG. 9, the coil wire is wound around the winding mold 100 a plurality of times to form the bent coil bundle shown in FIG. 3 (step S10). In this step (S10), for example, it is carried out as follows.

First, as shown in FIG. 10, a coil wire is wound around the main body 110 and the second partition 120b (middle stage winding frame) to form the first layer 16 as a middle stage coil bundle (step S11).

Specifically, the first partition 120a and the third partition 120c are arranged in the retreat area A, and the second partition 120b is arranged in the winding area B. In the winding area B, the upper winding surface 121b of the second partition 120b may be parallel to the lower winding surface 111 of the main body 110, but in the present embodiment, it is inclined. In this case, when the second partition 120b is moved in the radial direction, it is possible to prevent the coil wire from loosening, so that the coil end can be shortened.

While rotating the middle-stage winding frame, the winding nozzle that supplies the coil wire toward the middle-stage winding frame is moved in the radial direction. The coil wire may be wound around the middle winding frame by rotating the winding nozzle.

In addition, multiple coil wires are wound around the middle winding frame at the same time. That is, a plurality of coil wires arranged in the radial direction along the lower winding surface 111 of the main body 110 and the upper winding surface 121b of the second partition 120b are simultaneously wound. In addition, one coil wire may be wound sequentially around the middle winding frame.

The coil wires are guided and wound by the grooves 125 and 126 of the second partition 120b. Further, a plurality of coil wires to be wound at the same time are arranged in the region partitioned by the wall portion 127 of the second partition 120b. In FIG. 10, 10 coil wires are wound at the same time.

As a result, the first layer 16 in which a plurality of coil wires are lined up from the inside to the outside in the radial direction is formed. After that, as shown in FIG. 11, the second partition 120b is moved to the shelter area A.

Next, as shown in FIG. 12, the coil wire is wound around the main body 110 and the first partition 120a (lower winding frame) to form the second layer 17 as the lower coil bundle. Specifically, the first partition 120a is moved from the retreat area A to the winding area B. Similar to the formation of the first layer 16 (S11), the coil wire is wound around the lower winding frame. As a result, the second layer 17 is formed on the outer peripheral side of the first layer 16 and in which a plurality of coil wires are lined up from the inside to the outside in the radial direction.

Next, as shown in FIG. 13, the upper side in the axial direction of the second layer 17 is bent (step S13). In this step (S13), the blades 131 and 132 sandwich the coil wire crossing between the main body 110 and the first partition 120a from the inside and the outside in the circumferential direction of the coil bundle (see FIG. 3), and the first partition 120a It moves in the radial direction with respect to the main body 110. In FIG. 3, the upper side of the first layer 16 in the middle stage and the third layer 18 in the upper stage are also inclined, but in this step (S13), the upper side of the first layer 16 is not bent and the third layer 16 is not bent. The layer 18 is not formed.

Specifically, the first partition 120a is rotated inward in the radial direction. At this time, the upper end portion of the second layer 17 is inclined inward in the radial direction while being supported by the first partition 120a. As a result, the first partition 120a moves to the bending area C. By carrying out this step (S13), the second layer 16 having the inclined portion 14 can be formed as the lower-stage bent coil bundle.

Next, as shown in FIG. 14, the upper side in the axial direction of the first layer 16 is bent (step S14). In this step (S14), the blades 131 and 132 sandwich the coil wire crossing between the main body 110 and the second partition 120b from the inside and the outside in the circumferential direction of the coil bundle, and the second partition 120b with respect to the main body 110. Move in the radial direction.

Specifically, the second partition 120b arranged in the retreat area A as shown in FIG. 12 is moved to the winding area B as shown in FIG. 13, and further moved to the bending area C as shown in FIG. Moving. Similar to the step of bending the second layer 17 (S13), in the bending area C, the axially upper side of the first layer 16 is inclined inward in the radial direction. By carrying out this step (S14), the first layer 16 having the inclined portion 14 can be formed as the middle-stage bent coil bundle.

Next, as shown in FIG. 15, the coil wire is wound around the main body 110 and the third partition 120c (upper winding frame) to form the third layer 18 (step S15). Specifically, the third partition 120c is moved from the retreat area A to the winding area B. Similar to the second layer 17, the coil wire is wound around the upper winding frame. As a result, the third layer 18 which is arranged on the outer peripheral side of the second layer 17 and in which a plurality of coil wires are lined up from the inside to the outside in the radial direction is formed.

Next, as shown in FIG. 16, the upper side in the axial direction of the third layer 18 is bent (step S16). In this step (S16), the blades 131 and 132 sandwich the coil wire crossing between the main body 110 and the third partition 120c from the inside and the outside in the circumferential direction of the coil bundle, and the third partition 120c with respect to the main body 110. Move in the radial direction.

Specifically, similarly to the step (S13) of bending the second layer 17, in the bending area C, the axially upper side of the third layer 18 is inclined inward in the radial direction. By carrying out this step (S16), the third layer 18 having the inclined portion 14 can be formed as the upper-stage bent coil bundle.

In the above steps (S11 to S16) for forming the first to third layers 16 to 18 having the upper side bent, a plurality of partitions 120 are moved in the radial direction around one axis T. Each partition 120 moves in the radial direction due to the rotational movement.

Further, in the step of bending the second layer 17, the first layer 16, and the third layer 18 (S13, S14, S16), each inclined portion 14 has a passage portion 15 having a width smaller than the opening width of the slot open (FIG. 3) is provided. The passing portion 15 is formed by compressing. In the present embodiment, the passing portion 15 is compressed so that the gap between the coil wires becomes smaller in the radial direction and the axial direction. In axial view, at least a portion of the passages 15 of each layer 16-18 overlap.

In the present embodiment, in the step of bending the upper side of the coil bundle (S14, S16), the inclined portion 14 is sandwiched between the plurality of blades 131 and 132 extending in the axial direction from the inside and the outside in the circumferential direction of the coil bundle. Then, as shown in FIGS. 18 to 20, when the inclined portion 14 is formed in the step of bending the upper side of the coil bundle (S14, S16), the inclined portion 14 intersects the bending direction by the blades 131 and 132. It is bent in the direction. That is, the blades 131 and 132 bend the coil wire that crosses between the main body 110 and the partition 120 in a direction that intersects the crossover direction. Specifically, the inclined portions 14 are bent in the circumferential direction by the blades 131 and 132.

Specifically, as shown in FIG. 18, the inclined portion of the second layer 17 does not bend in the direction intersecting the bending direction. The blades 131 and 132 are arranged so that the second layer 17 does not bend. As shown in FIG. 19, the inclined portions of the first layer 16 are bent to the other side in the circumferential direction by the blades 131 and 132. As shown in FIG. 20, the inclined portions of the third layer 18 are bent to one side in the circumferential direction by the blades 131 and 132. By moving the blades 131 and 132 toward the outside and the inside in the radial direction, the inclined portion can be bent in the direction intersecting the bending direction. In the first layer 16 and the third layer 18, a second bending mark 13b bent in the circumferential direction is formed.

Next, the lower side of the coil bundle is compressed (step S17). That is, in the coil bundle, the coil wire wound around the main body 110 is compressed. In this step (S17), the axial cross-sectional shape of the coil wire wound around the main body 110 is compressed so as to be the axial cross-sectional shape of the slot 21. That is, the coil side portion 11 formed by winding the coil wire around a winding frame having the same shape as the slot 21 is compressed according to the shape of the slot 21. By compression, the cross-sectional area of the cross section perpendicular to the axial direction of the coil side portion 11 is made the same as the cross-sectional area of the cross section perpendicular to the axial direction of the slot 21. In addition, "same" means the same except for the dimensional tolerance. Further, the length of the coil side portion 11 in the circumferential direction is larger than the opening width in the circumferential direction of the slot open 22.

The compression is performed using, for example, a pressing member 115 (see FIG. 22). In the pressing member 115, the shape of the surface that abuts on the coil wire is the same as the shape of the circumferential side surface of the slot 21. Identical means identical except for dimensional tolerances. By pressing the pressing member 115 against the coil bundle wound around the main body 110, the gap between the coil wires can be reduced.

By carrying out these steps (S10), the bent coil bundle shown in FIGS. 3 and 17 can be formed. According to the present embodiment, the coil wire passing between the main body 110 and the partition 120 is sandwiched by a plurality of blades 131 and 132 from the inside and the outside in the circumferential direction, and the partition 120 is positioned radially inside with respect to the main body 110. be able to. As a result, the inclined portion 14 that is inclined with respect to the main body portion can be formed above the main body portion of the coil bundle 10 wound around the main body 110. Therefore, the main body portion of the coil bundle 10 can be inserted into the slot 21, and the inclined portion 14 of the coil bundle 10 can be inserted from the slot open 22 into the slot 21. For example, the space factor of the stator can be improved by compressing the main body portion.

In the coil bundle thus formed, in the coil side portion 11 inserted into the slot 21, a plurality of rows of coil wires are arranged in the circumferential direction as shown in FIG. 21, and in each of the rows, in the radial direction. A coil bundle can be formed so that a plurality of coil wires are lined up. In this embodiment, a plurality of coil wires are arranged in six rows in the circumferential direction. Ten coil wires are lined up in the radial direction at both ends in the circumferential direction. Twenty coil wires are lined up in the radial direction in the central portion other than both ends in the circumferential direction. Of the six rows in the circumferential direction of FIG. 21, the first layer 16, the second layer 17, and the third layer 18 are shown in every two rows from the bottom.

In the present embodiment, the coil side portion 11 is formed by matching the shape of the cross section perpendicular to the axial direction of the coil side portion 11 with the shape of the cross section perpendicular to the axial direction of the slot 21. Specifically, the number of coil wires arranged in the radial direction in each row in the circumferential direction is adjusted to the shape of the slot 21 as much as possible.

In the steps (S11, S12, S15) of forming the first layer 16, the second layer 17, and the third layer 18 of the present embodiment, as shown in FIG. 22, a wedge-shaped jig 41 or a wedge 40 is wound around. Attach to 100 and wind the coil wire. The wedge shape is a shape of a member that closes the radial opening of the slot open 22.

When the wedge 40 is attached to the winding mold 100, the wedge 40 is deformed so as to sandwich the radial inner end portion of the coil bundle. Further, in the compression step (S17), both the coil wire wound around the main body 110 and the wedge 40 are compressed. Specifically, the coil wire wound around the main body 110 and the wedge 40 are compressed so that the axial cross-sectional shape is the axial cross-sectional shape of the slot 21. By pressing the pressing member 115 against the coil bundle wound around the main body 110, the gap between the wedge 40 and the coil wire can be reduced.

<Retention of coil bundle>
23, 24, and 26 show only a part of the upper and lower surfaces of the stator core 20 so that the slot into which the coil bundle is inserted appears. As shown in FIG. 23, the coil bundle is held by a plurality of blades 131 and 132 arranged radially inside the stator core 20 (step S20). A part of the blades 131 and 132 may enter the slot 21 from the slot open 22. The blade for holding the coil bundle is not particularly limited, but the blades 131 and 132 of the winding type 100 are used. Specifically, the blades 131 and 132 used in the holding step (S20) are used in the step of bending one side of the coil bundle (S13, S15, S18). In the holding step (S20), the inclined portion 14 is arranged between the blades 131 and 132.

The holding step (S20) may be carried out in the inserting step (S30) described later. In this case, as shown in FIG. 24, the blades 131 and 132 are arranged corresponding to the teeth 23. Specifically, the plurality of blades 131 and 132 and the teeth 23 face each other in the radial direction and have the same circumferential positions. Therefore, in the storage step (S60) described later, the coil bundle is inserted into the slot open 22 from between the plurality of blades 131 and 132. Further, the blades 131 and 132 are arranged on the outer side in the radial direction of the coil moving mechanism 150 described later.

<Insert into slot>
Next, the coil bundle is inserted into the slot 21 from the lower side in the axial direction to the upper side of the slot 21 (step S30). That is, the coil bundle is inserted into the slot 21 from the bent upper side. In this step (S30), the bent coil bundle is inserted into the slot 21 from the lower side in the axial direction to the upper side of the two slots 21 of the stator core 20. In the present embodiment, the two slots 21 into which the folding coil bundle is inserted are one slot 21 sandwiching four slots 21 and another slot 21, but the present invention is not limited to this.

Specifically, as shown in FIG. 23, the bent coil bundle is arranged below the stator core 20 in the axial direction. At this time, the bent coil bundle is arranged with respect to the stator core 20 in a state where the passing portion 15 is located below the slot open 22 in the axial direction. Further, the bent coil bundle is arranged with respect to the stator core 20 in a state where the inclined portion 14 faces inward in the radial direction.

Then, as shown in FIG. 24, the bent coil bundle is moved upward in the axial direction. As a result, the coil side portion 11 is inserted into the slot 21. The lower coil crossing portion 12 straddles between the slots 21 at the bottom of the stator core 20. Further, the inclined portion 14 passes radially inside the coil side portion 11. The passing portion 15 of the inclined portion 14 passes through the slot open 22.

In the insertion step (S30), the coil bundle is inserted into the slot by the coil moving mechanism 150. Specifically, the coil bundle is brought into contact with the coil moving mechanism 150, and the coil moving mechanism 150 is moved upward. As a result, the inside of the coil bundle 10 is pulled upward while being hooked on the coil moving mechanism 150. From the viewpoint of reducing the load on the coil bundle, the coil moving mechanism 150 has, for example, a disk shape.

The coil moving mechanism 150 may have fins. The fins expand in diameter downward in the axial direction. In the storage step (S60) described later, the coil bundle 10 is pressed from the inside to the outside in the radial direction by the enlarged fins. The coil bundle 10 held by the blades 131 and 132 is inserted from the slot open 22 toward the inside of the slot 21.

In the insertion step (S30), the wedge-shaped jig 41 or wedge 40 and the coil bundle are both inserted into the slot 21. The wedge-shaped jig 41 or wedge 40 is located radially inward in the slot 21.

<Compression of the uninserted part of the coil bundle into the slot>
As shown in FIG. 24, the coil bundle is compressed on the lower side in the axial direction of the stator core 20 (step S40). That is, the portion of the coil bundle that has not been inserted into the slot 21 is compressed. As shown in FIG. 25, in this step (S40), the coil bundle is compressed so that the axial cross-sectional shape of the coil bundle becomes the axial cross-sectional shape of the slot 21.

As shown in FIGS. 24 and 25, in this step (S40), the coil bundle is compressed at a position where the axial cross-sectional position of the coil bundle and the axial cross-sectional position of the slot 21 overlap. It is sufficient that at least a part of the axial cross-sectional position of the coil bundle overlaps with the axial cross-sectional position of the slot 21, but the wider the overlap is, the better.

In this step (S40), the coil bundles are compressed in order while changing the compressed axial position. It is preferable to compress the coil bundle immediately before being inserted into the slot 21. Since the coil bundle can be compressed stepwise in the axial direction, the compression load can be reduced, and the equipment for compression can be miniaturized.

The inserting step (S30) and the compressing step (S40) are performed at the same time. "Simultaneous" means that the process of inserting and the process of compressing overlap in time series. The start time point and the end time point of each step may be simultaneous or different. By setting the insertion step and the compression step at the same timing, the coil bundle is moved upward in the axial direction, and the coil bundle is compressed stepwise in the axial direction. In this embodiment, just before the insertion, the coil bundle is compressed just below the slot 21. That is, the compressed portion of the coil bundle is inserted into the slot 21 immediately after being compressed. The axial movement of the coil bundle for changing the compression position also becomes the axial movement of the coil bundle for insertion into the slot 21.

In this step (S40), the coil bundles inserted into the plurality of slots 21 are simultaneously compressed. "Simultaneous" means that the step of compressing the coil bundle inserted into one slot 21 and the step of compressing the coil bundle inserted into the other slot 21 overlap in time series. The start time point and the end time point of each compression step may be simultaneous or different.

In FIGS. 24 and 25, the coil bundles inserted into the adjacent slots 21 are simultaneously compressed. Further, one coil bundle and another coil bundle may be compressed at the same time, or different parts of one coil bundle may be compressed at the same time.

Here, a method of compressing the coil inserted into one slot 21 by the compression device 200 will be described. First, the compression device 200 will be described.

As shown in FIG. 25, the compression device 200 includes a first jig 210, a second jig 220, a third jig 230, and a connecting member 240. The first jig 210 has a first side surface 211 arranged on one side in the circumferential direction and a second side surface 212 arranged on the other side in the circumferential direction. The second jig 220 is arranged on one side in the circumferential direction of the first jig 210 at intervals. The third jig 230 is arranged on the other side in the circumferential direction of the first jig 210 at intervals. The circumferential distance between the first jig 210 and the second jig 220 is narrower on the inner side in the radial direction than on the outer side in the radial direction. The circumferential distance between the first jig 210 and the third jig 230 is narrower on the inner side in the radial direction than on the outer side in the radial direction.

The second jig 220 and the third jig 230 are connected by a connecting member 240. The connecting member 240 is located radially inside the slot. Specifically, the connecting member 240 includes a portion 241 extending radially inward from the second jig 220, a portion 242 extending radially inward from the third jig 230, and portions 241 and 242, respectively. Includes a fastening member 243 to be fastened.

The compression device 200 may further include a moving member for moving the second jig 220 and the third jig 230. The moving member is, for example, an actuator.

Subsequently, a method of compressing the coil bundle on the lower side in the axial direction of the stator core 20 by using the compression device 200 will be described.

One end of the coil bundle in the circumferential direction is brought into contact with the first jig 210. The second jig 220 presses the coil bundle from the other end side in the circumferential direction. The second jig 220 comes into contact with each coil bundle from the circumferential direction. The second jig 220 is moved to the other side in the circumferential direction so that the second jig 220 approaches the first jig 210.

Further, the other end of the coil bundle in the circumferential direction is brought into contact with the first jig 210. The third jig 230 presses the coil bundle from the other end side in the circumferential direction. The third jig 230 comes into contact with each coil bundle from the circumferential direction. The third jig 230 is moved in the circumferential direction so that the third jig 230 approaches the first jig 210.

In the present embodiment, the coil bundles inserted into the adjacent slots 21 are simultaneously compressed. Specifically, one end of the coil bundle inserted into one of the slots 21 in the circumferential direction is brought into contact with the first side surface 211 of the first jig 210. One end of the coil bundle inserted into the other slot 21 in the circumferential direction is brought into contact with the second side surface 212 of the first jig 210. Next, the second jig 220 presses the coil bundle inserted into one of the slots 21 from the other end side in the circumferential direction. The third jig 230 presses the coil bundle inserted into the other slot 21 from the other end side in the circumferential direction. The second jig 220 and the third jig 230 are simultaneously moved to the first jig 210 side.

In the compression step (S40), the radial outer end of the coil bundle is brought into contact with the first jig 210. With this configuration, the coil bundle is compressed in the circumferential direction and the radial direction.

Further, in the step of forming the coil bundle (S10), the coil bundle is formed by using the round coil wire. In the compression step (S40), the cross-sectional shape of the coil wire is deformed into a square shape. By compression, the cross-sectional shape of the round line is deformed to improve the space factor.

The compression step (S40) may be performed without using the compression device provided with the jigs 210, 220, and 230 described above. For example, in the compression step (S40), the coil bundle is compressed by using a roller.

By carrying out this step (S40), the annular coil bundle is compressed on the lower side in the axial direction of the stator core 20, and the compressed portion is inserted into the slot 21. Therefore, the compressed and dense coil wire can be inserted into the slot 21. Therefore, the space factor of the stator 1 can be improved.

In this embodiment, in the step of forming the coil bundle (S10), the step of bending the plurality of layers and then compressing (S17) and the step of compressing the coil bundle on the lower side in the axial direction of the data core (step S40). And carry out. Since the step of compressing the coil bundle (step S40) is performed on the lower side in the axial direction of the stator core, the step of compressing (S17) may be omitted.

<Restoration of coil bundle>
Next, the bent coil bundle is restored to its original shape (step S50). In this step (S50), the angle of the inclined portion 14 is reduced in order to restore the bent coil bundle to the original shape. That is, this step (S50) includes restoring the folded coil bundle to the same shape as the original shape, and restoring the folded coil bundle to a state closer to the original shape than the folded state.

Specifically, the bent coil bundle is transformed into the coil bundle having the original shape. Specifically, the inclined portion 14 of each layer is rotated upward in the direction of the arrow shown in FIG. 26 so as to be parallel to the coil side portion 11 in the axial direction. As a result, the upper coil crossing portion 12 straddles the slot 21.

Specifically, the inclined portion 14 of the third layer 18 is restored to the original shape (step S51). Next, the inclined portion 14 of the first layer 16 is restored to the original shape (step S52). Next, the inclined portion 14 of the second layer 17 is restored to its original shape (step S53).

In this step (S51 to S53), as shown in FIG. 26, the coil stopper 160 is brought into contact with the lower end portion in the axial direction of the coil bundle. The coil stopper 160 is arranged axially below the lower end of the stator core 20. The coil stopper 160 abuts on a portion of the coil bundle located below the slot 21. The coil stopper 160 can apply a force outward in the radial direction to the lower end portion and the upper end portion of the coil bundle. Therefore, the coil bundle can be easily inserted into the slot 21.

In this step (S50), as shown in FIG. 26, the upper side of the coil bundle is restored to the original shape by moving the coil moving mechanism 150. Further, as the coil moving mechanism 150 rises, the blade 132 rises.

In this step (S50), the blade 131 that sandwiches the inclined portion 14 from the inside in the circumferential direction of the coil bundle is located below the blade 132 that sandwiches the inclined portion 14 from the outside in the circumferential direction of the coil bundle. For example, the blade 131 moves in the direction opposite to the insertion direction. This makes it possible to prevent interference with the blade 131 when the bent inclined portion 14 is restored. For example, the blade 131 moves in an axial position in order to correspond to the height of the inclined portion 14 of the first to third layers 16 to 18.

<Stored in slot>
The axially upper side of the coil bundle is housed in the slot 21 from the slot open 22 which is the radial opening of the slot 21 (step S60). In this step (S60), among the plurality of rows shown in FIG. 21, the row whose circumferential position overlaps with the slot open 22 is finally stored in the slot.

In the present embodiment, the slot open 22 is located at the center of the slot 21 in the circumferential direction. The plurality of columns is 3 or more. Therefore, in the storage step (S60), at least one row is stored on one side in the circumferential direction of the slot 21. At least one row is housed on the other side of the slot 21 in the circumferential direction. At least one row is finally stored in the circumferential center of the slot 21.

Specifically, the inclined portion of the third layer 18 is restored to the original shape (step S51). Then, as shown in FIG. 27, two rows of inclined portions of the third layer 18 are stored in the slot 21 on one side in the circumferential direction (upper side in FIG. 27) of the slot 21 (step S61). When the third layer 18 is restored to the same shape as the original shape, the inclined portion of the third layer 18 is stored in the slot 21.

Next, the inclined portion of the first layer 16 is restored to the original shape (step S52). Then, as shown in FIG. 28, two rows of inclined portions of the first layer 16 are housed on the other side (lower side in FIG. 28) of the slot 21 in the circumferential direction (step S62).

Finally, the inclined portion of the second layer 17 is restored to the original shape (step S53). Then, as shown in FIG. 29, two rows of inclined portions of the second layer 17 are housed in the central portion in the circumferential direction of the slot 21 (step S63).

In this way, it is possible to insert the coil bundle from a row that does not face the slot open 22 on the upper side in the axial direction. Therefore, by moving the row inserted in the slot 21 to one side and the other side in the circumferential direction away from the slot open 22, the resistance when inserting the next row to be inserted can be reduced. Therefore, the insertion resistance of the coil at the slot open 22 can be reduced.

Further, in the present embodiment, when forming the coil bundle, the coil wire is wound so that the second layer 17 is located at the lowest stage. Therefore, the second layer 17 can be finally stored in the slot 21 from the slot open 22.

Further, as shown in FIG. 19, the inclined portions of the two rows of the first layer 16 are bent to the other side in the circumferential direction, and as shown in FIG. 20, the inclined portions of the two rows of the third layer 18 are one in the circumferential direction. It is bent sideways, and as shown in FIG. 18, the two rows of inclined portions of the second layer 17 are not bent in the direction intersecting the bending direction. Therefore, the inclined portion of the third layer 18 can be easily inserted from the slot open 22 to one side in the circumferential direction of the slot 21. The inclined portion of the first layer 16 can be easily inserted from the slot open 22 to the other side in the circumferential direction of the slot 21. The inclined portion of the second layer 17 can be easily inserted into the central portion of the slot 21.

In FIGS. 18 to 20, two rows of coil wires are stored in the slot 21 from the slot open 22, but the present invention is not limited to this. The number of rows in which the circumferential width of the coil wire housed from the slot open 22 is smaller than the circumferential width of the slot open 22 can be arbitrarily selected.

The insulating paper 30 may be arranged in the slot 21 in advance, and the coil bundle may be inserted into the slot 21. Further, a coil bundle coated with the insulating paper 30 may be inserted into the slot 21.

When the wedge-shaped jig 41 is attached to the winding mold and the coil wire is wound, the wedge-shaped jig 41 is removed. After that, the wedge 40 is inserted into the space where the jig 41 is arranged.

By carrying out the above steps (S10 to S60), the stator can be manufactured as shown in FIG.

(Modification 1)
In the above-described embodiment, the third layer 18, the first layer 16, and the second layer 17 are located in the axially upper side of the coil bundle 10 in order from the axial direction, but the present invention is not limited thereto. On the upper side in the axial direction of the coil bundle, the third layer 18, the second layer 17, and the first layer 16 may be located in order from the upper side in the axial direction. In this case, the coil wire to be the first layer 16 is wound around the first partition 120a. A coil wire to be the second layer 17 is wound around the second partition 120b. A coil wire to be the third layer 18 is wound around the third partition 120c.

The first layer 16, the third layer 18, and the second layer 17 may be located on the upper side of the coil bundle in the axial direction in order from the upper side. Further, on the upper side in the axial direction of the coil bundle, the first layer 16, the second layer 17, and the third layer 18 may be located in order from the upper side in the axial direction.

As described above, the position of the inclined portion 14 of the coil bundle is not particularly limited. Therefore, the order of the steps of forming each layer and the step of bending (S11 to S16) is not limited to FIG.

(Modification 2)
In the above-described embodiment, the lower side of the coil bundle 10 in the axial direction is aligned in the axial direction, but the present invention is not limited to this. On the lower side in the axial direction, a coil bundle having a plurality of layers having different axial positions may be formed. For example, the third layer 18, the first layer 16, and the second layer 17 may be located on the lower side in the axial direction of the coil bundle in order from the upper side in the axial direction. Further, the third layer 18, the second layer 17, and the first layer 16 may be located on the lower side in the axial direction of the coil bundle in order from the upper side in the axial direction.

In this modification, when each layer is moved upward in the axial direction in the step (S30) of inserting into the slot 21, the movement may be stopped at the lower end portion of the coil bundle. When the third layer 18, the first layer 16, and the second layer 17 are located on the upper side in the axial direction of the coil bundle in order from the upper side in the axial direction, the following is performed. The rise of the third layer 18 is stopped by the lower coil crossing portion 12, and the inclined portion 14 of the third layer 18 is restored. Next, the ascent of the first layer 16 is stopped by the lower coil crossing portion 12, and the inclined portion 14 of the first layer 16 is restored. Next, the rise of the second layer 17 is stopped by the lower coil crossing portion 12, and the inclined portion 14 of the second layer 17 is restored.

(Modification 3)
In the above-described embodiment, the axial lengths of the first to third layers 16 to 18 are different from each other, but the axial lengths of the respective layers may be the same. By controlling the axial positions of the upper and lower sides of the coil bundle as in the first and second modifications, the axial length of each layer can be arbitrarily set.

(Modification example 4)
The winding mold 100 of the above-described embodiment has described, but is not limited to, an example of forming a coil bundle having a plurality of layers having different axial positions on the upper side in the axial direction. Since the winding mold 100 forms a coil bundle having at least one inclined portion, the number of partitions 120 may be one or more.

Further, the number of coil bundles to be inserted into one slot 21 may be one or a plurality. In the latter case, the annular coil bundle is inserted into the slot multiple times.

(Modification 5)
In the above-described embodiment, the step of bending the upper side of the coil bundle (S13, S14, S16) is carried out, but the step of bending (S13, S14, S16) may be omitted. In this case, in the insertion step (S30), the unbent annular coil bundle is inserted into the slot 22.

The embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 stator, 10 coil bundle, 11 coil side part, 12 coil crossing part, 13a 1st bending mark, 13b 2nd bending mark, 14 inclined part, 15 passing part, 16, 17, 18 layers, 20 stator core, 21 Slot, 22 slot open, 23 teeth, 30 insulated paper, 40 wedge, 41 jig, 100 wrapping type, 110 main body, 111 lower winding surface, 112, 122, 122a122b, 122c side winding surface, 115 pressing member , 120 partition, 120a 1st partition, 120b 2nd partition, 120c 3rd partition, 121, 121a, 121b, 121c upper winding surface, 125, 126 groove, 127 wall part, 131, 131 blade, 140 support member, 150 Coil movement mechanism, 160 coil stopper, 200 compressor, 210, 220, 230 jig, 240 connecting member, A relief area, B winding area, C bending area

Claims (12)

A method of manufacturing a stator having a stator core having a plurality of slots penetrating in the axial direction.
The process of forming an annular coil bundle in which the coil wire is wound multiple times, and
A step of inserting the coil bundle into the slot from the lower side in the axial direction to the upper side of the slot.
The step of compressing the coil bundle on the lower side in the axial direction of the stator core, and
Equipped with
The compression step is
The step of bringing one end of the coil bundle in the circumferential direction into contact with the first jig,
The step of pressing from the other end side in the circumferential direction of the coil bundle by the second jig,
A method of manufacturing a stator, including . The method for manufacturing a stator according to claim 1, wherein in the compression step, the coil bundle is compressed so that the axial cross-sectional shape of the coil bundle becomes the axial cross-sectional shape of the slot. The method for manufacturing a stator according to claim 1 or 2, wherein in the compression step, the coil bundle is compressed at a position where the axial cross-sectional position of the coil bundle and the axial cross-sectional position of the slot overlap. The method for manufacturing a stator according to any one of claims 1 to 3, wherein in the compression step, the coil bundles are sequentially compressed while changing the compressed axial position. The method for manufacturing a stator according to claim 4, wherein the insertion step and the compression step are performed at the same time. The method for manufacturing a stator according to any one of claims 1 to 5, wherein in the compression step, the coil bundles inserted into the plurality of slots are simultaneously compressed. The circumferential distance between the first jig and the second jig is narrower in the radial direction than in the radial outside, and in the compression step, the radial outer end of the coil bundle is applied to the first jig. The method for manufacturing a stator according to any one of claims 1 to 6 , further comprising a step of contacting the stator. The method for manufacturing a stator according to any one of claims 1 to 7 , wherein in the compression step, the coil bundles inserted into the adjacent slots are simultaneously compressed. The compression step is
A step of bringing one end of the coil bundle inserted into the slot in the circumferential direction into contact with the first side surface of the first jig.
A step of bringing one end of the coil bundle inserted into the other slot in the circumferential direction into contact with the second side surface of the first jig.
A step of pressing from the other end side in the circumferential direction of the coil bundle inserted into one of the slots by the second jig.
A step of pressing from the other end side in the circumferential direction of the coil bundle inserted into the other slot by the third jig.
8. The method for manufacturing a stator according to claim 8 . The method for manufacturing a stator according to any one of claims 1 to 6 and 8 , wherein in the compression step, the coil bundle is compressed by using a roller. In the forming step, the coil wire of the round wire is used.
The method for manufacturing a stator according to any one of claims 1 to 10 , wherein in the compression step, the cross-sectional shape of the coil wire is deformed into a square shape. The method for manufacturing a stator according to any one of claims 1 to 11 , further comprising a step of bending one side of the coil bundle and inserting the coil bundle from the one side.

Images